Question

❗❗❗ Максимум баллов ❗❗❗ Натрій нагрівають від 20°С до 105 °С. Побудуйте приблизний графік залежності температури металу від часу і поясніть його.​

Answer 1

1) смотрим температуру плавления натрия в таблице.

Это 98°С. Во время плавления энергия расходуется на разрушение кристаллов и температура при этом не меняется.

2) Примерный график на фото.

Для точного построения надо учитывать удельную теплоемкость твердого, жидкого натрия и его удельную теплоту плавления.

Answer 2

To construct an approximate graph of the temperature of sodium as it is heated from 20°C to 105°C, we can assume that the rate of temperature increase is constant. This means that the temperature will rise linearly over time.

Graph of Temperature vs. Time for Heating Sodium

To create the graph, we can use the following information: - Initial temperature: 20°C - Final temperature: 105°C

We can calculate the temperature increase per unit time by dividing the change in temperature by the total time taken to heat the sodium. In this case, the change in temperature is 105°C - 20°C = 85°C, and the total time taken is the duration of heating.

Let's assume the duration of heating is 10 minutes (600 seconds). We can calculate the temperature increase per second by dividing the change in temperature by the total time in seconds: 85°C / 600s ≈ 0.1417°C/s.

Using this information, we can plot the graph:

| Time (s) | Temperature (°C) | |----------|-----------------| | 0 | 20 | | 100 | 34.17 | | 200 | 48.33 | | 300 | 62.5 | | 400 | 76.67 | | 500 | 90.83 | | 600 | 105 |

Explanation of the Graph

The graph shows the relationship between the temperature of sodium and the time it takes to heat it from 20°C to 105°C.